The Bloodstock site itself hasn't been updated yet but I've seen multiple outlets report that Dethklok will be playing Aug 2027.
https://www.stereoboard.com/content/view/252499/9
edit: unconfirmed for Sunday night on the Sophie Lancaster stage
https://www.instagram.com/p/DZxl9FRugx_/?utm_source=ig_web_copy_link&igsh=NTc4MTIwNjQ2YQ==
Dethklok's doing a South American tour:
October 22 - Bogota, Colombia
October 24 - Santiago, Chile
October 25 - Buenos Aires, Argentina
October 27 - Sau Paulo, Brazil
October 29 - Chihuahua, Mexico
October 30 - Mexico City, Mexico
October 31 - Monterrey, Mexico
November 1 - Guadalajara, Mexico